gemini-3.1-pro-preview vs grok-4.3 Benchmark Comparison

Direct benchmark comparison between gemini-3.1-pro-preview and grok-4.3 based on LMArena Elo and the latest 2026 API pricing.

Direct Technical & Pricing Comparison

Frontier Model	LMArena Elo	API Cost (1M)	Throughput
gemini-3.1-pro-preview	1493	$0.000002	80
grok-4.3	1456	$0.00000125	71

*These models represent the Pareto Frontier (optimal cost-to-performance).*

Comparison Summary: gemini-3.1-pro-preview is the more capable model in this pair, leading by 37 Elo points. Specifically, gemini-3.1-pro-preview is currently on the Pareto line, suggesting it offers better systemic value for its performance tier.